Housings, Taps & Spares

How to choose a housing or part

Start with the size of the cartridge, then check how the housing connects to your pipes.

• 10" or 20", Standard or Jumbo

  Housings are sized to the cartridge they hold. Measure your old cartridge: about 250 mm end to end is a 10", and about 508 mm is a 20". Across the middle, about 63 mm is Standard and about 115 mm is Jumbo. Jumbo housings suit whole house systems, and Standard housings suit undersink and smaller setups. 20" housings take longer cartridges, so they suit larger homes.

• Check the port size

  The ports are the threaded inlet and outlet where the housing joins your pipes. Threaded fittings need the right BSP size, so check the port size on the product page against your pipework. Housings come without cartridges.

• Spanners, O-rings and brackets

  Housings are opened with a spanner made for that brand and size, which saves damaging the housing. If a housing drips, the most common cause is a worn or dry O-ring: replace it if it's cracked or flat, and use a little food-grade O-ring lube. Match O-rings to your housing make and size. Brackets hold housings to the wall.

• Taps, under-sink and RO parts

  Setting up an under-sink filter? You'll usually need a take-off valve, tubing and a filter tap, which sits beside your main tap and keeps filtered water separate. Tube sizes must match your connectors. For a benchtop filter, take the aerator off your tap and look for a thread: you may need an adapter or diverter valve. For RO spares, tell us the make and model of your system.